The stuff on CF is a bit too high for beginners, they have to learn the basics before going high performance.
my humble opinion
I suggested the vid of workout needed a few posteral changes, heels off the ground, bum back and knees slightly bent. By doing this it will allow more time for the muscle groups to be controlled. I assume CF med ball work is much closer to the wall with much more speed involved. The beginner would be relying more on the hip stabilisers as apposed to abs.